 /*******************************************************************************
  * Copyright (c) 2004, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.themes;

 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.ui.IPluginContribution;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.registry.IWorkbenchRegistryConstants;
 import org.eclipse.ui.themes.IThemePreview;

 /**
  * @since 3.0
  */
 public class ThemeElementCategory implements IPluginContribution,
         IThemeElementDefinition {

     private String description;

     private IConfigurationElement element;

     private String id;

     private String parentId;

     private String label;

     private String pluginId;

     /**
      *
      * @param label
      * @param id
      * @param parentId
      * @param description
      * @param pluginId
      * @param element
      */
     public ThemeElementCategory(String label, String id, String parentId,
             String description, String pluginId, IConfigurationElement element) {

         this.label = label;
         this.id = id;
         this.parentId = parentId;
         this.description = description;
         this.pluginId = pluginId;
         this.element = element;
     }

     /**
      * @return Returns the <code>IColorExample</code> for this category. If one
      * is not available, <code>null</code> is returned.
      * @throws CoreException thrown if there is a problem instantiating the preview
      */
     public IThemePreview createPreview() throws CoreException {
         String classString = element.getAttribute(IWorkbenchRegistryConstants.ATT_CLASS);
         if (classString == null || "".equals(classString)) { //$NON-NLS-1$
 return null;
         }
         return (IThemePreview) WorkbenchPlugin.createExtension(element,
                 IWorkbenchRegistryConstants.ATT_CLASS);
     }

     /**
      * @return Returns the description.
      */
     public String getDescription() {
         return description;
     }

     /**
      * @return Returns the element.
      */
     public IConfigurationElement getElement() {
         return element;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.themes.IThemeElementDefinition#getId()
      */
     public String getId() {
         return id;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.themes.IThemeElementDefinition#getLabel()
      */
     public String getName() {
         return label;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.IPluginContribution#getLocalId()
      */
     public String getLocalId() {
         return id;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.IPluginContribution#getPluginId()
      */
     public String getPluginId() {
         return pluginId;
     }

     /**
      * @return Returns the parentId. May be <code>null</code>.
      */
     public String getParentId() {
         return parentId;
     }
     
     /* (non-Javadoc)
      * @see java.lang.Object#equals(java.lang.Object)
      */
     public boolean equals(Object obj) {
         if (obj instanceof ThemeElementCategory) {
             return getId().equals(((ThemeElementCategory)obj).getId());
         }
         return false;
     }
     
     /* (non-Javadoc)
      * @see java.lang.Object#hashCode()
      */
     public int hashCode() {
         return id.hashCode();
     }
 }

